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Product Description
The 32311 (ISO/DIN designation) is a Single Row Tapered Roller Bearing with boundary dimensions of 55×120×45.5mm, manufactured to DIN ISO 355 / DIN 720 standards. Also designated 7611E under the GOST system, it is fully interchangeable with FAG 32311-A, NSK HR32311J, NTN 32311U, SKF 32311 (Explorer class), and Timken 32311.
With a dynamic load rating of 245 kN and static load rating of 250 kN — confirmed by SKF official data — the 32311 delivers robust combined radial and axial load capacity for a 55mm bore bearing. Its 5,600 rpm limiting speed (reference speed: 4,300 rpm) and 13° contact angle enable precise combined load handling with well-defined axial load factors (e=0.35, Y=1.7, Y₀=0.9) for accurate engineering calculations.
The bearing features a steel sheet metal cage, cylindrical bore, and is supplied open (without seals or lubricant) as standard. The separable inner ring (cone) and outer ring (cup) design facilitates independent mounting, dismounting, and maintenance. At ≈2.3–2.45 kg, it provides an excellent load-to-weight ratio for a 55mm bore heavy-duty tapered roller bearing.
Parameter | Value |
Part Number (ISO/DIN) | 32311 |
GOST Designation | 7611E |
FAG Equivalent | 32311-A |
NSK Equivalent | HR32311J |
NTN Equivalent | 32311U |
SKF Equivalent | 32311 (SKF Explorer) |
Timken Equivalent | 32311 |
Bearing Type | Single Row Tapered Roller Bearing |
Standard | DIN ISO 355 / DIN 720 |
Dimension Series | 2FD |
Bore Diameter (d) | 55 mm |
Outside Diameter (D) | 120 mm |
Total Width (T) | 45.5 mm |
Inner Ring Width (B) | 43 mm |
Outer Ring Width (C) | 35 mm |
Contact Angle | 13° |
Shoulder Diameter (d₁) | ≈84.6 mm |
Dynamic Load Rating (Cr) | 245 kN |
Static Load Rating (Cor) | 250 kN |
Fatigue Load Limit (Pu) | 28.5 kN |
Reference Speed | 4,300 r/min |
Limiting Speed | 5,600 r/min |
e value | 0.35 |
Y value | 1.7 |
Y₀ value | 0.9 |
Pressure Point Distance (a) | 29.4 mm |
r1,2 min | 2.5 mm |
r3,4 min | 2.0 mm |
da max | 68 mm |
db min | 66.5 mm |
Da min / max | 99 / 110.5 mm |
ra max | 2.5 mm |
rb max | 2.0 mm |
Weight | ≈2.3–2.45 kg |
Cage | Steel sheet metal, roller-guided |
Seal | Open (without seals) |
Lubricant | None (external lubrication required) |
Material | GCr15 / 52100 / 100Cr16 / SUJ2 Chrome Steel |
Tolerance Class | Normal / P0; P6/P5/P4/P2 available |
Bore Type | Cylindrical |
✅ Single Row Tapered Roller Design (DIN ISO 355 / DIN 720) — Handles combined high radial and axial loads in one direction with low friction and long service life; separable design allows independent mounting of inner and outer rings
✅ Cr=245kN / Cor=250kN (SKF Official Confirmed) — Robust load capacity for a 55mm bore bearing, confirmed by SKF official product data, suitable for heavy industrial and automotive applications
✅ Fatigue Load Limit Pu=28.5kN — Precisely defined fatigue threshold enabling accurate modified rating life (Lnm) calculations under variable load conditions per ISO 281
✅ 5,600 rpm Limiting Speed / 4,300 rpm Reference Speed — High-speed capability enabling use in automotive transmissions, industrial gearboxes, and moderate-to-high-speed heavy machinery
✅ 13° Contact Angle — Optimized contact angle providing well-balanced radial and axial load capacity, confirmed by SKF technical specification
✅ e=0.35 / Y=1.7 / Y₀=0.9 — Precisely defined axial load factors enabling accurate combined radial and axial load calculations for engineering design, confirmed by SKF official data
✅ SKF Explorer Performance Class — The SKF equivalent 32311 carries the SKF Explorer designation, indicating premium performance standards that NEXANS products are engineered to match and exceed
✅ Steel Sheet Metal Cage — Provides superior roller guidance, retention, and lubrication distribution under high-speed and high-load conditions
✅ Separable Design — Inner ring (cone) and outer ring (cup) are separable, facilitating easy installation, adjustment, and replacement in the field
✅ Adjustable Preload / Clearance — Can be mounted against another bearing with applied preload to achieve rigid bearing application
✅ HRC 60–64 Hardness — Premium GCr15/52100 chrome steel with precisely controlled hardness for exceptional wear resistance and fatigue life
✅ Full Global Interchangeability — Directly interchangeable with FAG 32311-A, NSK HR32311J, NTN 32311U, SKF 32311, Timken 32311
✅ Multi-Precision Options — P0/P6/P5/P4/P2 precision grades available for standard to ultra-precision applications
✅ Compact & Lightweight — At ≈2.3–2.45kg, delivers an excellent load-to-weight ratio for a 55mm bore heavy-duty tapered roller bearing
Based on the bearing's 55mm bore, 245kN dynamic load rating, 5,600rpm limiting speed, 13° contact angle, and single-row tapered roller design:
Industry | Application |
Automotive | Wheel hub bearings, transmission shafts, differential pinion shafts, axle gearboxes |
Agricultural / Tractor | Tractor gearbox shafts, combine harvester drives, PTO shaft bearings |
Industrial Gearboxes | Speed reducer input/output shafts, multi-stage industrial gearbox shafts |
Metallurgy / Steel Mills | Rolling mill auxiliary drives, section mill intermediate shafts |
Mining Equipment | Crusher auxiliary shafts, conveyor drive gearboxes, screening equipment |
Railways | Axlebox bearings, traction motor gearboxes |
Wind Turbines | Gearbox intermediate shafts, yaw drive systems |
Construction Machinery | Excavator swing drives, crane hoist gearboxes |
Oil & Gas | Pump drive shafts, compressor auxiliary equipment |
Paper & Pulp | Roll drive gearboxes, press section auxiliary drives |
Brand | Part Number |
NEXANS / NKS | 32311 |
GOST | 7611E |
FAG (Schaeffler) | 32311-A |
NSK | HR32311J |
NTN | 32311U |
SKF | 32311 (SKF Explorer) |
Timken | 32311 |
Material Equivalent | 52100 (AISI) / 100Cr16 (DIN) / SUJ2 (JIS) / GCr15 (GB) |
Model | GOST | d × D × T (mm) | Weight |
32310 | 7610E | 50×110×42.25 | 1.89 kg |
32311 | 7611E | 55×120×45.5 | ≈2.45 kg |
32312 | 7612E | 60×130×48.5 | 2.96 kg |
32313 | 7613E | 65×140×51 | 3.64 kg |
32314 | 7614E | 70×150×54.5 | 4.41 kg |
32315 | 7615E | 75×160×58.5 | 5.64 kg |
32316 | 7616E | 80×170×62 | 6.78 kg |
32317 | 7617E | 85×180×64 | 7.33 kg |
32318 | 7618E | 90×190×68 | 8.91 kg |
32319 | 7619E | 95×200×72 | 10.5 kg |
32320 | 7620E | 100×215×78 | 12.8 kg |
32321 | 7621E | 105×225×82 | 13.8 kg |
32322 | 7622E | 110×240×85 | 18.1 kg |
32324 | 7624E | 120×260×91 | 21.8 kg |
32326 | 7626E | 130×280×99.5 | 26.6 kg |
32328 | 7628E | 140×300×107.75 | 32.7 kg |
32330 | 7630E | 150×320×115 | 37.1 kg |
32334 | 7634E | 170×360×127 | 58.3 kg |
32336 | 7636E | 180×380×134 | 64.8 kg |
Key Series Insights:The 32311 (55×120×45.5mm, ≈2.45kg) sits between the 32310 and 32312, bridging the gap between the lightest 50mm bore entry and the heavier 60mm+ modelsIts 5,600rpm limiting speed and 13° contact angle (SKF confirmed) make it uniquely suited for high-speed 55mm shaft applications requiring precise combined load handlingThe e=0.35 / Y=1.7 / Y₀=0.9 axial load factors (identical to 32313 and 32314) confirm consistent design geometry across the 323xx series, simplifying engineering calculations for multi-shaft gearbox designsThe 323xx series provides full GOST / ISO / DIN cross-compatibility, ensuring seamless interchangeability with all major global bearing brands
Standard Export Packaging — Individual box + outer carton or custom packaging per customer requirements; multiple units per carton for cost-efficient shipping
Fast Delivery — Standard orders: 3–7 days from stock; DHL/FedEx/UPS express available (VIP member rates ~15% savings)
Global Shipping — LCL/FCL ocean freight, air freight, express courier — all options available
Full Export Documentation — Certificate of Origin (CO), material certificates, quality inspection reports, packing lists
OEM / Private Label — Custom branding & packaging available for distributors and OEM customers
Technical Support — 24-hour online technical support for installation, lubrication, and application engineering
Global Network — Offices/agents in 30+ countries and regions
Since 1997, Liaocheng Nexans Bearing Co., Ltd has been a trusted factory-direct manufacturer and global supplier of tapered roller bearings across automotive, agricultural, industrial, and heavy machinery sectors.
Factory-Direct Pricing — No middlemen, competitive wholesale rates
Large Ready Stock — 20,000+ bearing models in inventory, including full 323xx series
Flexible MOQ — Single-unit replacement orders to bulk OEM contracts
OEM / Private Label — Custom branding & packaging available
Full Export Documentation — CO, quality certificates, professional export packaging
Global Network — Offices/agents in 30+ countries and regions
24/7 Technical Support — Expert application engineering support for clearance, precision grade, and lubrication recommendations
Email: export@nksbearing.com WhatsApp: +86-15562839480 Website: www.nksbearing.com
NEXANS Bearing — Your trusted factory-direct partner for tapered roller bearings since 1997.
